Aimsun

1. New developments in Aimsun and future trends

2. Overview
• The integrated modelling philosophy
• What’s new in Aimsun 8.2
• New trends

3. Integrated modelling
MACRO
MESO
MICRO
Static assignment
Dynamic user
equilibrium
or
Stochastic route choice
OD Matrix
Network data base
Pathsand
pathflowsdatabase
Traffic flow representationTraffic assignment
HYBRID
S

4. Role of network loading engines
Traversal OD
Matrices &
adjustment
DTA with DUE, paths
assignment file
Detailed simulation,
Pedestrians

5. New in Aimsun 8.2 – Demand forecasting
• PT Crowding in cost functions
– Iterative Equilibrium process
• PT Congestion Model
– Effective Frequency Model
– Failure-to-board
• PT OD Adjustment
– uses the equilibrium PT assignment

6. New in Aimsun 8.2 – Macro level
• Macro Dynamic
– Presented yesterday
• Use of control plan
– Macro static assignment
– Macro static OD
adjustment
– TPF

7. New in Aimsun 8.2 – Meso level
• Initial state to start from
– Decrease DUE time for long periods

8. New in Aimsun 8.2 – Dynamic Traffic Assignment
• DUE New Gradient-
based method
• DUE Path pruning
• Incremental DUE
• Use Rgap matrices
asinput
• Output Rgap matrices
• Rgap for SRC

9. New in Aimsun 8.2 – Micro level
• Two-lane car-following
model between adjacent
sections
• Stop line adjustable
• DUE Path pruning
• Incremental DUE
• Use Rgap matrices as
input
• Output Rgap matrices
• Rgap for SRC

10. New in Aimsun 8.2 – Interfaces
• SCATS ITS Data
Port
• SCATS SRMS
• SIDRA interface
• VERSIT+ emissions
and energy use
model

11. New trends
• Improve usability of the
integrated framework
• Activity Base Model with
DTA
• Automated vehicles
• Aimsun Online
applications
• Peak spreading
techniques
• Meso parallelisation